v0.8.5: WebUI process timeline, Gemini-style images, aligned layout

Process timeline: a run of consecutive thinking and tool calls is one
block that folds to a single line ("思考 4 次 · 工具 6 次"; while running
it shows the current action) and opens into a compact timeline, one row
per thought or call. Visible text, a note or the next prompt closes the
block; history and the live stream follow the same rule. show_thinking
now also applies while streaming instead of forcing thoughts open.

Layout: the avatar gutter and the flex-wrap that dropped it under long
answers are gone, so answer, process blocks, notes and composer share one
left edge. The text column and composer are both 720px (--content); the
rail and run panel grow with clamp() on wide screens. A rebuild after
each turn no longer replays every entrance animation, and the turn time
survives it. Message actions are icon buttons and only appear under text.

Images: a prompt's images sit above the bubble, right-aligned (one keeps
its shape, several are 152px rounded tiles) and open in a lightbox (Esc,
arrow keys). Images uploaded from the page show as thumbnails over the
composer and appear on the prompt as soon as it is sent.

Also: ?theme= is no longer overridden by app.js, the user bubble is
visible in the light theme, and the narrow top bar no longer wraps.

docs/webui.md

@@ -209,6 +209,22 @@ Markdown 在**服务端**渲染（复用 TUI 用的 sashidown 流式 API），
 对话开始后自动隐去；右栏只给三件事——任务清单、本轮文件改动行数（`+N −M`）、上下文
 占用与 prompt cache 命中率。布局类在页面脚本之前就写进 `<body>`，避免首帧闪一下再收起。
 
+对话列：正文、过程块、提示行和输入框共用同一条左边线，正文宽度上限 720px（`--content`）；
+左右两栏随屏宽在 `clamp()` 范围内变宽，超宽屏下中间列不会无限拉开。
+
+过程时间线：一段**连续**的思考和工具调用合成一个过程块，折叠时只有一行
+（"思考 4 次 · 工具 6 次"；运行中显示当前动作，比如"执行 run_shell…"），展开后是一条
+细竖线串起的时间线，每次思考、每个工具调用各占一行，思考只露第一行，点开看全文。
+出现可见的正文（或引擎提示、下一句提问）时过程块就此结束，后面的思考/工具另起一块——
+历史重建（`/api/session`）和实时事件流用的是同一条规则，所以刷新前后看到的一样。
+`/thinking on|off`（`show_thinking`）决定过程块和其中的思考默认展开还是收起，流式输出时也照此执行；
+`/details` 只管工具行是否展开。
+
+图片：提问附带的图片显示在气泡**上方**、靠右，一张保持原比例（最长 260px），多张是
+152px 的圆角方块；点开是大图预览（Esc 关闭，←/→ 切换）。从本页上传/粘贴/拖入的图片在
+输入框上方显示缩略图，发送后立刻出现在新提问上（本地预览，本轮结束后换成 `/api/attach/<rel>`）；
+从别的客户端加的待发图片仍然显示为文字条。
+
 ### 命令与快捷键
 
 输入框以 `/` 开头时是命令，在页面里执行，不发给模型：打 `/` 弹出列表（↑↓ 选，Tab 补全，
@@ -259,10 +275,11 @@ sh scripts/e2e_webui.sh tests/fixtures/sse/deepseek-ctl-heredoc ctl-heredoc
 1. 打开首页 → 顶部显示 workspace/模型/审批模式，右下状态"就绪"。
 2. 输入一句话 → 助手气泡逐字出现；工具卡片自动展开、结束后带 `exit=` 标记。
 3. 切到 `ask` 审批 → 写文件时弹窗；点"允许一次"后继续，点"拒绝"则该工具返回失败但对话继续。
-4. `会话` 按钮：新建/切换后历史正确重建（刷新页面也一样）：工具调用折叠成"本轮工具调用"，
-   点开能看到参数和输出；搜索、重命名、删除可用。
+4. `会话` 按钮：新建/切换后历史正确重建（刷新页面也一样）：连续的思考和工具调用折叠成一行
+   过程块，展开是时间线，工具行点开能看到参数和输出；搜索、重命名、删除可用。
+   `/thinking off` 时流式输出的思考也保持收起。
 4a. 最后一句提问上有"编辑重发"，最后一个回答上有"重新生成"；右栏文件行点开是真实 diff。
-5. 拖入一张图片 → 底部出现待发送提示，发送后历史里能看到图。
+5. 拖入一张图片 → 输入框上方出现缩略图，发送后图片立刻出现在提问气泡上方，点开是大图预览。
 6. 关掉标签页再打开 → 事件流自动续传，不丢已完成的消息。
 
 ## 限制与已知问题

include/cst_version.h

@@ -3,7 +3,7 @@
 
 #define CST_VERSION_MAJOR 0
 #define CST_VERSION_MINOR 8
-#define CST_VERSION_PATCH 4
+#define CST_VERSION_PATCH 5
 
 #define CST_VERSION_STR_(x) #x
 #define CST_VERSION_STR(x) CST_VERSION_STR_(x)

web/app.js

@@ -165,8 +165,11 @@ const log = $('log');
 const scroll = $('scroll');
 let state = {};
 let live = null;            /* streaming assistant block */
-let steps = null;           /* this turn's tool list */
+let proc = null;            /* the open process block: thinking + tool calls */
 let stepIndex = new Map();  /* tool call id -> step row */
+let lastTurn = null;        /* { session, ms }: the last turn's time, kept across the rebuild */
+let pendingPreviews = [];   /* { src, name }: object URLs of the images uploaded from this page */
+let shownPreviews = [];     /* the ones the newest prompt still shows until the rebuild */
 let files = new Map();      /* this turn's file changes: path -> {add, del} */
 let permReq = null;
 let askReq = null;
@@ -277,58 +280,61 @@ function updateJump() {
 function showEmpty(show) {
   $('empty').classList.toggle('gone', !show);
 }
+/* every row of the transcript shares one left edge, the composer's: no avatar
+ * column, the assistant reads as plain text, only errors carry a mark */
 function bubble(role, cls) {
   const m = el('div', 'msg ' + (cls || role));
-  /* no avatar per message: the assistant reads as plain text in the column,
-   * the way the reference transcript does; only errors get a mark */
-  const g = el('div', 'gutter', role === 'error' ? '!' : '');
   const b = el('div', 'body');
-  m.appendChild(g);
   m.appendChild(b);
   log.appendChild(m);
   showEmpty(false);
   scrollDown(true);
   return { root: m, body: b };
 }
-function copyButton(text) {
-  const b = el('button', null, '复制');
-  b.onclick = async () => {
-    try {
-      await navigator.clipboard.writeText(text);
-      b.textContent = '已复制';
-      setTimeout(() => { b.textContent = '复制'; }, 1200);
-    } catch { b.textContent = '复制失败'; }
-  };
+function actBtn(name, title, fn) {
+  const b = el('button', 'act');
+  b.title = title;
+  b.setAttribute('aria-label', title);
+  b.appendChild(icon(name));
+  b.onclick = fn;
   return b;
 }
-function attachStrip(atts) {
-  const strip = el('div', 'attach-strip');
-  for (const a of atts) {
+function copyButton(text) {
+  const b = actBtn('copy', '复制', async () => {
+    try {
+      await navigator.clipboard.writeText(text);
+      setIcon(b, 'check');
+      b.title = '已复制';
+      setTimeout(() => { setIcon(b, 'copy'); b.title = '复制'; }, 1200);
+    } catch { toast('浏览器不允许写剪贴板'); }
+  });
+  return b;
+}
+/* images sit above the prompt, outside the bubble: one keeps its shape, more
+ * than one become a row of square tiles; a click opens the full picture */
+function attachStrip(srcs) {
+  const strip = el('div', 'attach-strip' + (srcs.length === 1 ? ' one' : ''));
+  srcs.forEach((s, i) => {
+    const b = el('button', 'thumb');
+    b.title = s.name || '查看图片';
     const img = el('img');
-    img.alt = a.name || 'image';
+    img.alt = s.name || 'image';
     img.loading = 'lazy';
-    img.src = attachURL(a.rel);
-    strip.appendChild(img);
-  }
+    img.decoding = 'async';
+    img.src = s.src;
+    b.appendChild(img);
+    b.onclick = () => openLightbox(srcs, i);
+    strip.appendChild(b);
+  });
   return strip;
 }
-/* reasoning belongs inside .body: as a sibling it becomes a second flex item
- * and squeezes the answer into a narrow column */
-function thinkInto(body, text, open) {
-  let d = body.querySelector(':scope > details.think');
-  let t;
-  if (!d) {
-    d = el('details', 'think');
-    d.appendChild(el('summary', null, '思考过程'));
-    t = el('div');
-    d.appendChild(t);
-    body.insertBefore(d, body.firstChild);
-  } else {
-    t = d.querySelector('div');
-  }
-  if (open) d.open = true;
-  t.textContent += text;
-  return d;
+function userBubble(text, srcs) {
+  const b = bubble('user');
+  b.body.textContent = text;
+  if (srcs && srcs.length) b.root.insertBefore(attachStrip(srcs), b.body);
+  b.root.dataset.prompt = '1';
+  actionsFor(b.root, text);
+  return b;
 }
 function actionsFor(root, text) {
   const row = el('div', 'msg-actions');
@@ -336,6 +342,119 @@ function actionsFor(root, text) {
   root.appendChild(row);
   return row;
 }
+
+/* --- lightbox ------------------------------------------------------------ */
+
+let lb = null;   /* { srcs, i } while a picture is open */
+function showLightbox() {
+  const s = lb.srcs[lb.i];
+  $('lb-img').src = s.src;
+  $('lb-img').alt = s.name || '';
+  const many = lb.srcs.length > 1;
+  $('lb-count').textContent = many ? (lb.i + 1) + ' / ' + lb.srcs.length : '';
+  $('lb-prev').hidden = !many;
+  $('lb-next').hidden = !many;
+}
+function openLightbox(srcs, i) {
+  lb = { srcs: srcs.slice(), i };
+  showLightbox();
+  $('lightbox').hidden = false;
+}
+function closeLightbox() {
+  $('lightbox').hidden = true;
+  $('lb-img').removeAttribute('src');
+  lb = null;
+}
+function stepLightbox(d) {
+  if (!lb || lb.srcs.length < 2) return;
+  lb.i = (lb.i + d + lb.srcs.length) % lb.srcs.length;
+  showLightbox();
+}
+
+/* --- process timeline -----------------------------------------------------
+ * Consecutive thinking and tool calls share one block that folds to a single
+ * line; visible text (or a note, or the next prompt) closes it. History and
+ * the live stream follow the same rule, so a reload draws what streamed. */
+
+function procLabel(p) {
+  const parts = [];
+  if (p.thinks) parts.push(p.thinks > 1 ? '思考 ' + p.thinks + ' 次' : '已思考');
+  if (p.tools) parts.push('工具 ' + p.tools + ' 次');
+  const counts = parts.join(' · ');
+  if (p.root.classList.contains('run')) {
+    p.lbl.textContent = p.act || '处理中…';
+    p.meta.textContent = counts;
+  } else {
+    p.lbl.textContent = counts || '过程';
+    p.meta.textContent = '';
+  }
+}
+function ensureProc() {
+  if (proc) return proc;
+  if (live && live.html) sealLive();
+  const d = el('details', 'proc');
+  d.open = !!state.show_thinking;
+  const s = el('summary', 'proc-sum');
+  s.appendChild(icon('chevron', 'proc-chev'));
+  const lbl = el('span', 'proc-lbl');
+  const meta = el('span', 'proc-meta');
+  s.appendChild(lbl);
+  s.appendChild(meta);
+  const box = el('div', 'tl');
+  d.appendChild(s);
+  d.appendChild(box);
+  log.appendChild(d);
+  showEmpty(false);
+  proc = { root: d, lbl, meta, box, thinks: 0, tools: 0, cur: null, act: '' };
+  procLabel(proc);
+  return proc;
+}
+function sealProc() {
+  if (!proc) return;
+  proc.root.classList.remove('run');
+  procLabel(proc);
+  proc = null;
+}
+function procAct(p, text) {
+  p.root.classList.add('run');
+  p.act = text;
+  procLabel(p);
+}
+function firstLine(s) {
+  const l = String(s).split('\n').find((x) => x.trim()) || '';
+  return l.trim().slice(0, 200);
+}
+function procThink(text, running) {
+  const p = ensureProc();
+  let t = p.cur && p.cur.kind === 'think' ? p.cur : null;
+  if (!t) {
+    const d = el('details', 'tl-item think');
+    d.open = !!state.show_thinking;
+    const s = el('summary');
+    s.appendChild(el('span', 'tl-dot'));
+    s.appendChild(el('span', 'tl-name', '思考'));
+    const prev = el('span', 'tl-prev');
+    s.appendChild(prev);
+    const body = el('div', 'think-text');
+    const node = document.createTextNode('');
+    body.appendChild(node);
+    d.appendChild(s);
+    d.appendChild(body);
+    p.box.appendChild(d);
+    t = { kind: 'think', root: d, prev, node, hasLine: false };
+    p.cur = t;
+    p.thinks++;
+  }
+  t.node.appendData(text);
+  /* the preview is the first line, so it stops changing once that is whole */
+  if (!t.hasLine) {
+    t.prev.textContent = firstLine(t.node.data);
+    t.hasLine = /\S[^\n]*\n/.test(t.node.data);
+  }
+  if (running) procAct(p, '正在思考…');
+  else procLabel(p);
+  return t;
+}
 /* "[cst] Plan mode is now ON: ..." notes the engine adds to the history; the
  * model reads the English, the page shows one line per change */
 const APPROVAL_ZH = { ask: '每次询问', auto: '自动', yolo: '完全放行' };
@@ -355,6 +474,7 @@ function noteLine(text) {
     .map((l) => zhOf(NOTE_ZH, l) || l);
   const n = el('div', 'note-line', shown.join(' · '));
   n.title = String(text || '');
+  sealProc();
   log.appendChild(n);
 }
 /* history: the stored calls become the same step lines a live turn draws,
@@ -381,15 +501,23 @@ function renderMessage(m) {
   if (m.note) return noteLine(m.content);
   if (m.role === 'tool' || m.tool_result) return historyResult(m);
   const isUser = m.role === 'user';
-  if (isUser) steps = null;   /* each prompt starts its own step list */
   const text = m.text !== undefined ? m.text : (m.content || '');
-  if (isUser || text.trim() || m.reasoning || (m.attach && m.attach.length)) {
-    const b = bubble(isUser ? 'user' : 'assistant');
-    if (!isUser && m.html) b.body.innerHTML = m.html;
+  if (isUser) {
+    sealProc();
+    stepIndex = new Map();
+    const srcs = (m.attach || []).map((a) => ({ src: attachURL(a.rel), name: a.name }));
+    userBubble(text, srcs);
+    return;
+  }
+  if (m.reasoning) {
+    procThink(m.reasoning, false);
+    proc.cur = null;   /* the next round's thinking is its own entry */
+  }
+  if (text.trim()) {
+    sealProc();
+    const b = bubble('assistant');
+    if (m.html) b.body.innerHTML = m.html;
     else b.body.textContent = text;
-    if (m.reasoning) thinkInto(b.body, m.reasoning, !!state.show_thinking);
-    if (m.attach && m.attach.length) b.body.insertBefore(attachStrip(m.attach), b.body.firstChild);
-    if (isUser) b.root.dataset.prompt = '1';
     actionsFor(b.root, text);
   }
   for (const c of m.calls || []) historyCall(c);
@@ -400,12 +528,12 @@ function lastPromptActions() {
   const p = prompts[prompts.length - 1];
   if (!p) return;
   const row = p.querySelector('.msg-actions');
-  if (row) row.appendChild(Object.assign(el('button', null, '编辑重发'), { onclick: () => editLast(p) }));
+  if (row) row.appendChild(actBtn('edit', '编辑重发', () => editLast(p)));
   const answers = log.querySelectorAll('.msg.assistant');
   const a = answers[answers.length - 1];
   if (a && (p.compareDocumentPosition(a) & Node.DOCUMENT_POSITION_FOLLOWING)) {
     const r = a.querySelector('.msg-actions');
-    if (r) r.appendChild(Object.assign(el('button', null, '重新生成'), { onclick: () => retry() }));
+    if (r) r.appendChild(actBtn('retry', '重新生成', () => retry()));
   }
 }
 
@@ -415,17 +543,23 @@ async function loadSession() {
   stepIndex = new Map();
   files = new Map();
   renderFilesPanel();
-  steps = null;
+  proc = null;
   live = null;
   for (const m of data.messages) renderMessage(m);
-  for (const d of log.querySelectorAll('details.turn-steps')) d.open = detailsAll;
-  steps = null;
+  sealProc();
   stepIndex = new Map();
   lastPromptActions();
+  if (lastTurn && lastTurn.session === state.session && log.lastChild) turnMeta(lastTurn.ms);
   if (turnErr && turnErr.session === state.session) {
     if (turnErr.stopped) noteLine('已停止');
     else bubble('error').body.textContent = turnErr.text;
   }
+  /* a rebuild is not new content: settle every entrance animation at once */
+  if (log.getAnimations) {
+    for (const a of log.getAnimations({ subtree: true })) {
+      try { a.finish(); } catch { /* an infinite pulse cannot finish; it keeps running */ }
+    }
+  }
   showEmpty(log.children.length === 0);
   const last = [...(data.messages || [])].reverse().find((m) => m.role === 'user' && !m.note && !m.tool_result);
   document.title = (last && last.content ? last.content.slice(0, 40) + ' · ' : '') + 'CST-Agent';
@@ -435,28 +569,22 @@ async function loadSession() {
 
 /* --- live blocks --------------------------------------------------------- */
 
+/* text closes the process block above it; thinking or a tool call after the
+ * text closes the answer, so the next words start a bubble below them */
 function ensureLive() {
   if (live) return live;
+  sealProc();
   const b = bubble('assistant');
   b.body.classList.add('live');
-  /* the answer gets its own box: rewriting body.innerHTML would drop the
-   * reasoning <details> that thinkInto keeps at the top of body */
   const out = el('div', 'live-html');
   b.body.appendChild(out);
   live = { root: b.root, body: b.body, out, html: '' };
   return live;
 }
-function ensureSteps() {
-  if (steps) return steps;
-  const d = el('details', 'turn-steps');
-  d.open = true;
-  const s = el('summary', 'steps-sum', '本轮工具调用');
-  d.appendChild(s);
-  const box = el('div', 'steps-box');
-  d.appendChild(box);
-  log.appendChild(d);
-  steps = { root: d, sum: s, box, count: 0 };
-  return steps;
+function sealLive() {
+  if (!live) return;
+  live.body.classList.remove('live');
+  live = null;
 }
 function phaseText(p) {
   return { open: '准备中', ready: '待执行', run: '执行中', progress: '进行中', done: '完成' }[p] || p || '';
@@ -471,24 +599,26 @@ function argsLine(args) {
 function stepFor(ev) {
   let st = stepIndex.get(ev.id);
   if (st) return st;
-  const c = ensureSteps();
-  const node = el('details', 'step-line run');
+  const p = ensureProc();
+  const node = el('details', 'tl-item step-line run');
   node.open = detailsAll;
   const sum = el('summary');
   const name = el('span', 'name', ev.name || 'tool');
   const args = el('span', 'args');
   const phase = el('span', 'phase', '准备中');
+  sum.appendChild(el('span', 'tl-dot'));
   sum.appendChild(name);
   sum.appendChild(args);
   sum.appendChild(phase);
   const body = el('div', 'step-body');
   node.appendChild(sum);
   node.appendChild(body);
-  c.box.appendChild(node);
-  st = { root: node, sum, name, args, phase, body, t0: Date.now(), bad: false };
+  p.box.appendChild(node);
+  st = { kind: 'tool', root: node, sum, name, args, phase, body, t0: Date.now(), bad: false, proc: p };
   stepIndex.set(ev.id, st);
-  c.count++;
-  c.sum.textContent = '本轮工具调用 · ' + c.count + ' 次';
+  p.cur = st;
+  p.tools++;
+  procLabel(p);
   return st;
 }
 
@@ -630,6 +760,10 @@ function onTool(ev) {
     st.root.classList.add('done');
     st.phase.textContent = '完成 · ' + ((Date.now() - st.t0) / 1000).toFixed(1) + 's';
   }
+  if (st.proc === proc) {
+    procAct(proc, ev.phase === 'done' ? '等待模型…'
+      : (ev.phase === 'progress' && ev.detail ? ev.detail : '执行 ' + (ev.name || '工具') + '…'));
+  }
   scrollDown(false);
 }
 function onToolResult(ev) {
@@ -642,6 +776,7 @@ function onToolResult(ev) {
   if (st.args.textContent) st.body.appendChild(el('pre', 'step-args-full', st.args.textContent));
   if (ev.out) st.body.appendChild(el('pre', 'step-out', ev.out + (ev.truncated ? '\n… (截断)' : '')));
   if (!st.bad) noteFileChange(ev);
+  if (st.proc === proc) procAct(proc, '等待模型…');
   scrollDown(false);
 }
 function turnMeta(ms) {
@@ -741,29 +876,62 @@ function applyState(s) {
   syncSend();
   if (!busy && !permReq) $('status').textContent = '就绪';
 
+  renderPending();
+  renderTodo(s.todo);
+  if ('show_thinking' in s && s.show_thinking !== shownThinking) {
+    shownThinking = s.show_thinking;
+    for (const d of log.querySelectorAll('details.proc, details.tl-item.think')) d.open = !!s.show_thinking;
+  }
+}
+const revokeAll = (list) => { for (const s of list) URL.revokeObjectURL(s.src); };
+/* images waiting for the next prompt: thumbnails when this page uploaded all
+ * of them, otherwise (another client, the CLI) the server's one-line notes */
+let pendingSeen = 0;   /* the server's count last time: an upload's reply can beat its state event */
+function renderPending() {
   const p = $('pending');
-  const n = (s.pending_images || []).length;
+  const list = state.pending_images || [];
+  const n = list.length;
+  if (!n && pendingSeen && pendingPreviews.length) {
+    revokeAll(pendingPreviews);
+    pendingPreviews = [];
+  }
+  pendingSeen = n;
   p.hidden = !n;
-  if (n) {
-    p.textContent = '';
-    for (const line of s.pending_images) {
+  p.textContent = '';
+  if (!n) return;
+  const clear = () => post('api/attach', undefined, 'DELETE').catch(toastErr);
+  const clearTitle = n > 1 ? '清空全部 ' + n + ' 张待发图片' : '移除这张图片';
+  if (pendingPreviews.length === n) {
+    pendingPreviews.forEach((s, i) => {
+      const t = el('div', 'pend-thumb');
+      const img = el('img');
+      img.src = s.src;
+      img.alt = s.name || 'image';
+      img.title = list[i];
+      img.onclick = () => openLightbox(pendingPreviews, i);
+      const x = el('button', 'pend-x');
+      x.title = clearTitle;
+      x.setAttribute('aria-label', clearTitle);
+      x.appendChild(icon('close'));
+      x.onclick = clear;
+      t.appendChild(img);
+      t.appendChild(x);
+      p.appendChild(t);
+    });
+  } else {
+    for (const line of list) {
       const chip = el('span', 'chip');
       chip.appendChild(el('span', null, line));
       const x = el('button', 'icon tiny');
       x.appendChild(icon('close'));
       x.title = '清空待发图片';
-      x.onclick = () => post('api/attach', undefined, 'DELETE').catch(toastErr);
+      x.onclick = clear;
       chip.appendChild(x);
       p.appendChild(chip);
     }
-    if (s.sees_images === 0)
-      p.appendChild(el('span', 'chip warn', (s.model || '当前模型') + ' 不识图：图片不会发给模型，换个识图模型再发'));
-  }
-  renderTodo(s.todo);
-  if ('show_thinking' in s && s.show_thinking !== shownThinking) {
-    shownThinking = s.show_thinking;
-    for (const d of log.querySelectorAll('details.think')) d.open = !!s.show_thinking;
   }
+  if (state.sees_images === 0)
+    p.appendChild(el('span', 'chip warn', (state.model || '当前模型') + ' 不识图：图片不会发给模型，换个识图模型再发'));
 }
 
 /* --- SSE ----------------------------------------------------------------- */
@@ -787,7 +955,7 @@ function connect() {
   });
   on('think_delta', (d) => {
     markBusy();
-    thinkInto(ensureLive().body, d.text || '', true);
+    procThink(d.text || '', true);
     scrollDown(false);
   });
   on('tool', (ev) => { markBusy(); onTool(ev); });
@@ -795,8 +963,9 @@ function connect() {
   on('todo', (d) => renderTodo(d.text));
   on('session', (d) => {
     closePop();
-    live = null; steps = null; stepIndex = new Map();
+    live = null; proc = null; stepIndex = new Map();
     turnErr = null;
+    lastTurn = null;
     loadSession().then(loadSessions).catch(toastErr);
     closeDrawers();
     if (d && d.id) $('status').textContent = '已切换会话';
@@ -805,16 +974,24 @@ function connect() {
   on('permission_done', hideGate);
   on('ask_user', showAsk);
   on('turn_end', (d) => {
-    if (turnStart) { turnMeta(Date.now() - turnStart); turnStart = 0; }
-    if (live) live.body.classList.remove('live');
-    live = null; steps = null; stepIndex = new Map();
+    lastTurn = turnStart ? { session: state.session, ms: Date.now() - turnStart } : null;
+    turnStart = 0;
+    sealLive();
+    sealProc();
+    stepIndex = new Map();
     /* the reload below rebuilds the log, so the reason is drawn after it */
     turnErr = d && d.rc ? {
       text: turnError(d),
       stopped: /cancelled$/.test(d.error || ''),
       session: state.session,
     } : null;
-    loadSession().then(loadSessions).catch(toastErr);
+    loadSession().then(() => {
+      /* the rebuilt prompt shows the server's copies now */
+      if (!lb || !lb.srcs.some((s) => shownPreviews.includes(s))) {
+        revokeAll(shownPreviews);
+        shownPreviews = [];
+      }
+    }).then(loadSessions).catch(toastErr);
   });
   /* the browser resumes from Last-Event-ID; a restarted server has none of
    * those events, so its state (and maybe session) is fetched afresh */
@@ -887,6 +1064,12 @@ async function answerGate(value) {
   }
 }
 window.addEventListener('keydown', (e) => {
+  if (lb) {
+    if (e.key === 'Escape') { e.preventDefault(); closeLightbox(); }
+    else if (e.key === 'ArrowLeft') { e.preventDefault(); stepLightbox(-1); }
+    else if (e.key === 'ArrowRight') { e.preventDefault(); stepLightbox(1); }
+    return;
+  }
   /* typing "3" or "y" into the box must not grant a permission */
   const typing = e.isComposing || e.ctrlKey || e.metaKey || e.altKey ||
     (e.target && (e.target.isContentEditable || /^(INPUT|TEXTAREA|SELECT)$/.test(e.target.tagName)));
@@ -1668,15 +1851,16 @@ function editLast(node) {
   syncSend();
   input.focus();
 }
-function freshTurn(text) {
-  const b = bubble('user');
-  b.body.textContent = text;
-  b.root.dataset.prompt = '1';
-  steps = null;
+function freshTurn(text, srcs) {
+  sealProc();
+  sealLive();
+  revokeAll(shownPreviews);
+  shownPreviews = srcs || [];
+  userBubble(text, shownPreviews);
   stepIndex = new Map();
   files = new Map();
-  live = null;
   turnErr = null;
+  lastTurn = null;
   renderFilesPanel();
   turnStart = Date.now();
 }
@@ -1731,11 +1915,23 @@ async function send(text) {
     setEditing(false);
     return retry(body);
   }
-  freshTurn(body);
+  /* the images go out with this prompt: draw them now from the local copies */
+  const pend = (state.pending_images || []).length;
+  let srcs = [];
+  if (pend && pendingPreviews.length === pend) {
+    srcs = pendingPreviews;
+    pendingPreviews = [];
+  }
+  freshTurn(body, srcs);
   try {
     await post('api/turn', { text: body });
     if (busy) $('status').textContent = '已开始…';
   } catch (e) {
+    if (srcs.length && !pendingPreviews.length && shownPreviews === srcs) {
+      pendingPreviews = srcs;   /* still waiting on the server: keep the thumbnails */
+      shownPreviews = [];
+      renderPending();
+    }
     bubble('error').body.textContent = errMsg(e);
   }
 }
@@ -1805,7 +2001,7 @@ function setThinking(a) {
 function setDetails(a) {
   detailsAll = onOffArg(a, detailsAll);
   localStorage.setItem('cst.details', detailsAll ? '1' : '0');
-  for (const d of log.querySelectorAll('details.turn-steps, details.step-line')) d.open = detailsAll;
+  for (const d of log.querySelectorAll('details.step-line')) d.open = detailsAll;
   toast(detailsAll ? '工具输出全部展开' : '工具输出全部收起', 'ok');
 }
 async function providerCmd(a) {
@@ -2220,6 +2416,8 @@ async function upload(file) {
     body: file,
   });
   try { await readReply(r); } catch (e) { toast('上传失败：' + errMsg(e)); return; }
+  pendingPreviews.push({ src: URL.createObjectURL(file), name: file.name || 'pasted.png' });
+  renderPending();
   if (state.sees_images === 0) toast((state.model || '当前模型') + ' 不识图，这张图不会发给模型', 'warn');
 }
 
@@ -2335,10 +2533,13 @@ document.addEventListener('drop', async (e) => {
   for (const f of e.dataTransfer.files) await upload(f);
 });
 $('backdrop').onclick = closeDrawers;
+$('lightbox').onclick = (e) => { if (e.target === $('lightbox')) closeLightbox(); };
+$('lb-close').onclick = closeLightbox;
+$('lb-prev').onclick = () => stepLightbox(-1);
+$('lb-next').onclick = () => stepLightbox(1);
 
 /* --- go ------------------------------------------------------------------ */
 
-applyTheme(localStorage.getItem('cst.theme') || 'dark');
 /* the rail/panel/theme classes are already on <body> from the inline script in
  * index.html, so nothing here has to re-derive them */
 autoGrow();

web/index.html

@@ -41,6 +41,10 @@
   <symbol id="i-lv4" viewBox="0 0 24 24"><path d="M4 18.5V13h2.6v5.5zM8.7 18.5V10h2.6v8.5zM13.4 18.5V6.8h2.6v11.7zM18.1 18.5V4h2.6v14.5z" class="f"/></symbol>
   <symbol id="i-file" viewBox="0 0 24 24"><path d="M13.5 3.5H7A2.5 2.5 0 0 0 4.5 6v12A2.5 2.5 0 0 0 7 20.5h10A2.5 2.5 0 0 0 19.5 18V9.5z"/><path d="M13.5 3.5v6h6"/></symbol>
   <symbol id="i-clock" viewBox="0 0 24 24"><circle cx="12" cy="12" r="8.5"/><path d="M12 7.2V12l3.2 2"/></symbol>
+  <symbol id="i-edit" viewBox="0 0 24 24"><path d="M14.8 5.2l4 4L9 19H5v-4z"/><path d="M12.6 7.4l4 4"/></symbol>
+  <symbol id="i-retry" viewBox="0 0 24 24"><path d="M4.5 12a7.5 7.5 0 0 1 13-5.1M19.5 12a7.5 7.5 0 0 1-13 5.1"/><path d="M17.8 3.6v3.6h-3.6M6.2 20.4v-3.6h3.6"/></symbol>
+  <symbol id="i-left" viewBox="0 0 24 24"><path d="M14.5 6l-6 6 6 6"/></symbol>
+  <symbol id="i-right" viewBox="0 0 24 24"><path d="M9.5 6l6 6-6 6"/></symbol>
   <symbol id="i-folder" viewBox="0 0 24 24"><path d="M3.5 6.5A1.5 1.5 0 0 1 5 5h4l2 2.5h8A1.5 1.5 0 0 1 20.5 9v9A1.5 1.5 0 0 1 19 19.5H5A1.5 1.5 0 0 1 3.5 18z"/></symbol>
 </svg>
 
@@ -216,6 +220,13 @@
 <div id="backdrop"></div>
 <div id="pop" class="pop" hidden></div>
 <div id="modal" hidden><div id="modal-box"></div></div>
+<div id="lightbox" hidden>
+  <img id="lb-img" alt="">
+  <button id="lb-close" class="lb-btn" title="关闭 (Esc)"><svg class="i"><use href="#i-close"/></svg></button>
+  <button id="lb-prev" class="lb-btn" title="上一张 (←)"><svg class="i"><use href="#i-left"/></svg></button>
+  <button id="lb-next" class="lb-btn" title="下一张 (→)"><svg class="i"><use href="#i-right"/></svg></button>
+  <span id="lb-count"></span>
+</div>
 <div id="toast" class="toast" role="status" aria-live="polite" hidden></div>
 <script>
 /* Layout is decided here, before app.js runs and before the first paint: the

web/style.css

@@ -35,6 +35,7 @@
   --composer-surface-secondary: #202026;
 
   --bg-code: #08080a;
+  --bubble-user: var(--main-surface-tertiary);
 
   /* every hover/active tint is alpha, so it lands correctly on any surface */
   --hover: color-mix(in srgb, var(--text-primary) 7%, transparent);
@@ -68,8 +69,11 @@
   --accent: var(--accent-primary);
   --danger: var(--text-error);
 
-  --rail: 252px;
-  --panel: 296px;
+  /* the side columns grow with the screen so a wide window does not turn into
+   * one wide middle: the text stays near the run panel it is read against */
+  --rail: clamp(240px, 14vw, 280px);
+  --panel: clamp(296px, 20vw, 380px);
+  --content: 720px;   /* text column and composer share this edge */
   --radius: 12px;
   --radius-lg: 22px;
   --shadow: 0 16px 40px rgba(0, 0, 0, .45);
@@ -103,6 +107,7 @@
   --composer-surface-secondary: #f4f4f6;
 
   --bg-code: #f5f5f7;
+  --bubble-user: #eef0f4;
 
   --accent-primary: #0f9d70;
   --accent-fg: #ffffff;
@@ -306,7 +311,7 @@ body.no-side #side { pointer-events: none; }
   border-radius: 99px; padding: 2px; position: relative;
 }
 .seg button {
-  height: 25px; padding: 0 12px; border-radius: 99px; color: var(--fg-dim); font-size: 12.5px;
+  height: 25px; padding: 0 12px; white-space: nowrap; border-radius: 99px; color: var(--fg-dim); font-size: 12.5px;
   transition: color var(--t-fast), background var(--t);
 }
 .seg button.on { background: var(--bg-lift); color: var(--fg); font-weight: 600; }
@@ -316,7 +321,7 @@ body.no-side #side { pointer-events: none; }
   flex: 1 1 auto; overflow-y: auto; padding: 22px 0 10px;
   scroll-behavior: smooth; scrollbar-gutter: stable;
 }
-#log { max-width: 760px; margin: 0 auto; padding: 0 20px; }
+#log { max-width: calc(var(--content) + 40px); margin: 0 auto; padding: 0 20px; }
 #log:empty { display: none; }
 
 /* --- empty state ---------------------------------------------------------- */
@@ -330,16 +335,22 @@ body.no-side #side { pointer-events: none; }
 }
 
 /* --- transcript ----------------------------------------------------------- */
-.msg { display: flex; gap: 12px; padding: 13px 0 0; animation: fade-up var(--t) var(--ease) both; }
-.msg .gutter { flex: 0 0 24px; padding-top: 2px; color: var(--fg-faint); font-size: 11px; text-align: center; user-select: none; }
-.msg .body { min-width: 0; flex: 1 1 auto; }
-.msg.user { justify-content: flex-end; }
-.msg.user .gutter { display: none; }
+/* one left edge for everything (answer, process block, notes), the same edge
+ * as the composer; prompts hang on the right edge with their images above */
+.msg { display: flex; flex-direction: column; align-items: stretch; padding: 14px 0 0; animation: fade-up var(--t) var(--ease) both; }
+.msg .body { min-width: 0; max-width: 100%; }
+.msg.user { align-items: flex-end; padding-top: 24px; }
+#log > .msg.user:first-child { padding-top: 6px; }
 .msg.user .body {
-  background: var(--bg-lift); border-radius: 18px 18px 6px 18px;
-  padding: 9px 15px; max-width: 76%; white-space: pre-wrap; word-break: break-word;
+  background: var(--bubble-user); border-radius: 24px;
+  padding: 11px 18px; max-width: min(76%, 560px); white-space: pre-wrap; word-break: break-word;
 }
 .msg.error .body { color: var(--danger); white-space: pre-wrap; }
+.msg.error .body::before {
+  content: "!"; display: inline-flex; align-items: center; justify-content: center;
+  width: 18px; height: 18px; margin-right: 8px; border-radius: 50%; vertical-align: 1px;
+  background: color-mix(in srgb, var(--danger) 18%, transparent); font-size: 12px; font-weight: 800;
+}
 .body > :first-child, .live-html > :first-child { margin-top: 0; }
 .body > :last-child, .live-html > :last-child { margin-bottom: 0; }
 .body h1, .body h2, .body h3, .body h4 { line-height: 1.35; margin: 1.1em 0 .5em; }
@@ -370,63 +381,102 @@ body.no-side #side { pointer-events: none; }
   background: var(--accent); animation: blink 1.1s steps(2, start) infinite;
 }
 
-.attach-strip { display: flex; flex-wrap: wrap; gap: 8px; margin: 2px 0 8px; justify-content: flex-end; }
-.attach-strip img {
-  width: 108px; height: 108px; object-fit: cover; border-radius: 12px;
-  border: 1px solid var(--line); animation: rise var(--t) var(--ease) both;
+/* a prompt's images: above the bubble and outside it, square tiles when there
+ * are several, the picture's own shape when there is one */
+.attach-strip { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 12px; margin: 0 0 10px; max-width: 100%; }
+.attach-strip .thumb {
+  display: block; width: 152px; height: 152px; padding: 0; overflow: hidden; cursor: zoom-in;
+  border-radius: 20px; border: 1px solid var(--line); background: var(--bg-soft);
+  animation: rise var(--t) var(--ease) both;
+  transition: border-color var(--t-fast), transform 90ms var(--ease);
+}
+.attach-strip .thumb:hover { border-color: var(--line-strong); }
+.attach-strip .thumb:active { transform: scale(.985); }
+.attach-strip .thumb img { display: block; width: 100%; height: 100%; object-fit: cover; }
+.attach-strip.one .thumb { width: auto; height: auto; }
+.attach-strip.one .thumb img {
+  width: auto; height: auto; min-width: 72px; min-height: 72px;
+  max-width: min(260px, 70vw); max-height: 260px; object-fit: contain;
 }
 
-.turn-meta { display: flex; align-items: center; gap: 10px; padding: 10px 0 2px 36px; }
+.turn-meta { display: flex; align-items: center; gap: 10px; padding: 8px 0 2px; }
 .turn-meta details > summary { cursor: pointer; list-style: none; color: var(--fg-faint); font-size: 12px; transition: color var(--t-fast); }
 .turn-meta details > summary::-webkit-details-marker { display: none; }
 .turn-meta details > summary:hover { color: var(--fg-dim); }
-.msg:has(> .msg-actions) { flex-wrap: wrap; row-gap: 0; }
-.msg-actions { display: flex; flex-basis: 100%; gap: 2px; padding: 4px 0 0 36px; opacity: 0; transition: opacity var(--t) var(--ease); }
+/* the actions take a row only under messages that have text to act on */
+.msg-actions { display: flex; gap: 2px; padding-top: 4px; margin-left: -7px; opacity: 0; transition: opacity var(--t) var(--ease); }
+.msg.user .msg-actions { margin: 0 -7px 0 0; }
 .msg:hover .msg-actions, .msg-actions:focus-within { opacity: 1; }
-.msg-actions button {
-  height: 26px; padding: 0 9px; border-radius: 8px; color: var(--fg-faint); font-size: 12px;
+.act {
+  width: 30px; height: 28px; border-radius: 8px; color: var(--fg-faint);
+  display: inline-flex; align-items: center; justify-content: center;
+  transition: background var(--t-fast), color var(--t-fast), transform 90ms var(--ease);
+}
+.act svg.i { width: 16px; height: 16px; }
+.act:hover { background: var(--bg-hover); color: var(--fg); }
+.act:active { transform: scale(.94); }
+
+/* --- process block: a run of thinking and tool calls, folded to one line --- */
+.proc { margin: 10px 0 0; }
+.proc-sum {
+  display: inline-flex; align-items: center; gap: 7px; max-width: 100%; height: 28px;
+  margin-left: -7px; padding: 0 10px 0 6px; border-radius: 8px;
+  cursor: pointer; list-style: none; color: var(--fg-faint); font-size: 13px; user-select: none;
   transition: background var(--t-fast), color var(--t-fast);
 }
-.msg-actions button:hover { background: var(--bg-hover); color: var(--fg); }
-
-.think { margin: .1em 0 .5em; }
-.think summary { cursor: pointer; list-style: none; color: var(--fg-faint); font-size: 12.5px; transition: color var(--t-fast); }
-.think summary::-webkit-details-marker { display: none; }
-.think summary::before { content: "▸ "; }
-.think[open] summary::before { content: "▾ "; }
-.think summary:hover { color: var(--fg-dim); }
-.think > div {
-  color: var(--fg-dim); font-size: 13.5px; white-space: pre-wrap;
-  padding: 6px 0 2px 14px; border-left: 2px solid var(--line);
-  animation: fade-in var(--t) var(--ease) both;
+.proc-sum::-webkit-details-marker { display: none; }
+.proc-sum:hover { background: var(--bg-hover); color: var(--fg-dim); }
+.proc-chev { width: 14px; height: 14px; transform: rotate(-90deg); transition: transform var(--t) var(--ease); }
+.proc[open] > .proc-sum .proc-chev { transform: none; }
+.proc-lbl { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.proc-meta { flex: 0 0 auto; color: var(--fg-quat); font-size: 12px; white-space: nowrap; }
+.proc-meta:empty { display: none; }
+/* the running block's label shimmers instead of spinning */
+.proc.run .proc-lbl {
+  background: linear-gradient(90deg, var(--fg-faint) 0%, var(--fg) 45%, var(--fg-faint) 90%);
+  background-size: 220% 100%; -webkit-background-clip: text; background-clip: text;
+  color: transparent; animation: shimmer 1.8s linear infinite;
 }
 
-/* tool calls: one line, opens on demand (like "已执行 python · <<PY>") */
-.turn-steps { padding: 6px 0 0 36px; }
-.turn-steps > summary { cursor: pointer; list-style: none; color: var(--fg-faint); font-size: 12.5px; transition: color var(--t-fast); }
-.turn-steps > summary::-webkit-details-marker { display: none; }
-.turn-steps > summary::before { content: "⌘ "; }
-.turn-steps > summary:hover { color: var(--fg-dim); }
-.steps-box { padding: 2px 0 0 12px; margin-top: 4px; border-left: 2px solid var(--line); }
-.step-line { animation: fade-up var(--t) var(--ease) both; }
-.step-line > summary {
-  display: flex; align-items: baseline; gap: 8px; cursor: pointer; list-style: none;
-  padding: 5px 0; font-size: 13px; color: var(--fg-dim);
+/* the timeline: one hairline, one dot per entry */
+.tl { position: relative; margin: 2px 0 0; padding: 2px 0 2px 20px; animation: fade-in var(--t) var(--ease) both; }
+.tl::before {
+  content: ""; position: absolute; left: 4px; top: 14px; bottom: 14px; width: 1px;
+  background: var(--line);
+}
+.tl-item { position: relative; animation: fade-up var(--t) var(--ease) both; }
+.tl-item > summary {
+  display: flex; align-items: center; gap: 8px; min-height: 28px; padding: 2px 0;
+  cursor: pointer; list-style: none; font-size: 13px; color: var(--fg-dim);
   transition: color var(--t-fast);
 }
-.step-line > summary::-webkit-details-marker { display: none; }
-.step-line > summary:hover { color: var(--fg); }
-.step-line .name { font-family: var(--mono); font-size: 12.5px; color: var(--fg); }
-.step-line .args { flex: 1 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-family: var(--mono); font-size: 12px; }
-.step-line .phase { font-size: 11.5px; color: var(--fg-faint); white-space: nowrap; display: inline-flex; align-items: center; gap: 6px; }
-.step-line.run .phase { color: var(--warn); }
-.step-line.run .phase::before {
-  content: ""; width: 6px; height: 6px; border-radius: 50%;
-  background: var(--warn); animation: pulse 1.1s var(--ease) infinite;
+.tl-item > summary::-webkit-details-marker { display: none; }
+.tl-item > summary:hover { color: var(--fg); }
+.tl-dot {
+  position: absolute; left: -20px; top: 9px; width: 9px; height: 9px; border-radius: 50%;
+  background: var(--bg); border: 1.5px solid var(--line-strong);
 }
+.tl-item.think .tl-dot { border-color: color-mix(in srgb, var(--violet) 75%, transparent); }
+.tl-name { flex: 0 0 auto; font-size: 12.5px; color: var(--fg-dim); }
+.tl-prev {
+  flex: 1 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
+  color: var(--fg-faint); font-size: 12.5px;
+}
+.tl-item.think[open] .tl-prev { visibility: hidden; }
+.think-text {
+  color: var(--fg-dim); font-size: 13px; line-height: 1.65; white-space: pre-wrap; word-break: break-word;
+  padding: 2px 0 8px; animation: fade-in var(--t) var(--ease) both;
+}
+
+/* tool calls: one line each, open for arguments and output */
+.step-line .name { flex: 0 0 auto; font-family: var(--mono); font-size: 12.5px; color: var(--fg); }
+.step-line .args { flex: 1 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-family: var(--mono); font-size: 12px; color: var(--fg-faint); }
+.step-line .phase { flex: 0 0 auto; font-size: 11.5px; color: var(--fg-faint); white-space: nowrap; }
+.step-line.run .phase { color: var(--warn); }
+.step-line.run .tl-dot { border-color: var(--warn); background: color-mix(in srgb, var(--warn) 30%, var(--bg)); animation: pulse 1.1s var(--ease) infinite; }
+.step-line.done .tl-dot { border-color: var(--accent-line); background: var(--accent-weak); }
+.step-line.bad .tl-dot { border-color: var(--danger); background: color-mix(in srgb, var(--danger) 20%, var(--bg)); }
 .step-line.bad .phase, .step-line.bad .name { color: var(--danger); }
-.step-line.done .phase::before { content: "✓"; }
-.step-line.bad .phase::before { content: "✕"; }
 /* a sub-agent's latest steps, next to its task */
 .step-line .step-detail {
   flex: 0 1 40%; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
@@ -435,7 +485,7 @@ body.no-side #side { pointer-events: none; }
 .step-line.done .step-detail { display: none; }
 /* "[cst] plan mode is now ON" and other engine notes in the history */
 .note-line {
-  padding: 6px 0 2px 36px; font-size: 12px; color: var(--fg-faint);
+  padding: 8px 0 2px; font-size: 12px; color: var(--fg-faint);
   white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
 }
 .note-line::before { content: "· "; }
@@ -459,9 +509,24 @@ body.no-side #side { pointer-events: none; }
 
 /* --- composer ------------------------------------------------------------- */
 #composer { padding: 8px 20px 12px; }
-#composer > * { max-width: 760px; margin: 0 auto; }
-.pending { display: flex; flex-wrap: wrap; gap: 8px; padding: 0 0 8px; }
+#composer > * { max-width: var(--content); margin: 0 auto; }
+.pending { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; padding: 6px 0 10px; }
 .pending .chip { background: var(--bg-soft); border-color: var(--line); }
+/* images waiting for the next prompt, the way they will look once sent */
+.pend-thumb { position: relative; width: 56px; height: 56px; flex: 0 0 auto; animation: rise var(--t) var(--ease) both; }
+.pend-thumb img {
+  display: block; width: 100%; height: 100%; object-fit: cover; cursor: zoom-in;
+  border-radius: 12px; border: 1px solid var(--line);
+}
+.pend-x {
+  position: absolute; top: -7px; right: -7px; width: 20px; height: 20px; border-radius: 50%;
+  display: flex; align-items: center; justify-content: center;
+  background: var(--main-surface-tertiary); border: 1px solid var(--line-strong); color: var(--fg-dim);
+  opacity: 0; transition: opacity var(--t-fast), color var(--t-fast);
+}
+.pend-x svg.i { width: 12px; height: 12px; stroke-width: 2.2; }
+.pend-thumb:hover .pend-x, .pend-x:focus-visible { opacity: 1; }
+.pend-x:hover { color: var(--fg); }
 .edit-bar {
   display: flex; align-items: center; gap: 8px; padding: 6px 10px; margin-bottom: 8px;
   border-radius: 10px; border: 1px solid var(--line); background: var(--bg-soft);
@@ -698,9 +763,6 @@ body.no-panel #panel { pointer-events: none; }
 .todo-list .boxmark { color: var(--fg-faint); }
 .todo-list li.done { color: var(--fg-faint); text-decoration: line-through; }
 .todo-list li.doing { color: var(--fg); font-weight: 600; }
-#steps-body .step-line > summary { font-size: 12.5px; }
-#steps-body .step-line .phase { font-size: 11px; }
-
 /* --- modal sheet (session list) ------------------------------------------- */
 #modal {
   position: fixed; inset: 0; background: rgba(0, 0, 0, .5); z-index: 40;
@@ -808,11 +870,44 @@ body.drawer-open #backdrop { display: block; }
   body.side-open #side, body.panel-open #panel { transform: none; }
   .only-narrow { display: inline-flex; }
   #to-bottom { bottom: 150px; right: 16px; }
-  .hero h1 { font-size: 21px; }
   .msg.user .body { max-width: 88%; }
-  .turn-meta, .msg-actions, .turn-steps, .note-line { padding-left: 0; }
+  .attach-strip .thumb { width: 120px; height: 120px; }
+  #lightbox { padding: 56px 12px; }
+}
+@media (max-width: 560px) {
+  #chip-approval .lbl { display: none; }
+  .seg button { padding: 0 9px; }
 }
 @media (min-width: 901px) { #backdrop { display: none !important; } }
+/* touch screens have no hover: the actions stay visible */
+@media (hover: none) {
+  .msg-actions, .pend-x { opacity: 1; }
+}
+
+/* --- lightbox ------------------------------------------------------------- */
+#lightbox {
+  position: fixed; inset: 0; z-index: 70; padding: 56px 72px;
+  display: flex; align-items: center; justify-content: center;
+  background: rgba(0, 0, 0, .84); animation: fade-in var(--t) var(--ease) both;
+}
+#lb-img {
+  max-width: 100%; max-height: 100%; object-fit: contain; border-radius: 12px;
+  box-shadow: 0 20px 60px rgba(0, 0, 0, .5); animation: pop-in 180ms var(--ease) both;
+}
+.lb-btn {
+  position: absolute; width: 40px; height: 40px; border-radius: 50%;
+  display: flex; align-items: center; justify-content: center;
+  background: rgba(255, 255, 255, .1); color: #fff;
+  transition: background var(--t-fast), transform 90ms var(--ease);
+}
+.lb-btn:hover { background: rgba(255, 255, 255, .2); }
+#lb-close { top: 14px; right: 14px; }
+#lb-prev { left: 14px; top: calc(50% - 20px); }
+#lb-next { right: 14px; top: calc(50% - 20px); }
+#lb-count {
+  position: absolute; bottom: 18px; left: 50%; transform: translateX(-50%);
+  color: rgba(255, 255, 255, .75); font-size: 13px; font-variant-numeric: tabular-nums;
+}
 
 /* --- motion --------------------------------------------------------------- */
 @keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@@ -821,6 +916,7 @@ body.drawer-open #backdrop { display: block; }
 @keyframes pop-in { from { opacity: 0; transform: translateY(-4px) scale(.97); } to { opacity: 1; transform: none; } }
 @keyframes pulse { 0%, 100% { opacity: .3; transform: scale(.85); } 50% { opacity: 1; transform: scale(1); } }
 @keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
+@keyframes shimmer { from { background-position: 100% 0; } to { background-position: -120% 0; } }
 @media (prefers-reduced-motion: reduce) {
   *, *::before, *::after { animation-duration: 1ms !important; transition-duration: 1ms !important; }
   #scroll { scroll-behavior: auto; }